Fill in the response. See the 2 person dialog:
[1]. What is the importance of Buenos Aires to the economy of Argentina?
[2]. Aires City's commuter rail provides 1800 trains carrying 1.4 million passengers each business day in the city of Buenos Aires, its suburbs in Greater Buenos Aires and several far-reaching satellite towns.
[1]. Are there any other interesting aspects about this article?
[2]. Service is provided by private companies and spreads out from five central stations in Buenos Aires: Retiro, Constitución, Once and Federico Lacroze – all serving both long-distance and local passenger services – and Buenos Aires Station which, despite its name, is a secondary rail terminus serving only local commuter services and will cease to be a terminal once the Belgrano Sur Line is extended to Constitución.
[1]. What are the different stations?
[2]. 
The Retiro and Constitución train stations are linked by Line C of the Buenos Aires Underground, Once is served by Line A of the underground via its "Plaza Miserere" station and by Line H's Once station, while Federico Lacroze is served by Line B. The smaller Buenos Aires Station is accessible by some city bus services and it is the only railway terminus in Buenos Aires that has no access to the Buenos Aires Underground, though it is connected to the Metrobus Sur line.